Cartridge for grease gun



May 8, 1956 E. DE 5. HOOVER CARTRIDGE FOR GREASE GUN Filed Sept. 5, 1952 IN VEN TOR.

United States Patent CARTRIDGE FOR GREASE GUN Lawrence E. de S. Hoover, Washington, D. C., assignor to General Cap and Container Corporation, New York, N. Y., a corporation of Delaware Application September 5, 1952, Serial No. 308,052

1 Claim. Cl. 222-95 This invention relates to a cartridge for grease guns or other lubricating apparatus.

The greases used for lubricating heavy bearings, such as the chassis hearings of an automobile, are quite viscous and sticky, and they are normally forced into the bearing by a grease gun. The replenishment of the grease in the gun is, however a messy task, and it may result in getting sand or dirt in the grease, with consequent harm to the bearings. This is particularly important where the gun must be replenished in the field.

It is an object of this invention to provide a cartridge in which a charge of grease may be stored and handled, so constructed that the grease may be kept sealed until the time for use, and then may be transferred to the gun, with the minimum of difliculty, and without getting dirt in the grease during the transfer.

The cartridge shown in the accompanying drawing is the preferred embodiment of the invention. Fig. l is a central longitudinal section of a complete cartridge filled with grease. Fig. 2 is a view of the device while the grease is being transferred to the grease gun. Fig. 3 is a a section on the line 3-3 of Fig. 1.

The cartridge consists primarily of an outer cylinder shell of cardboard or the like open at both ends. Within this shell there slides an inner shell 15 having one end open and one end, here the lower end, closed as shown at 17. Within this inner shell is a flexible bag 11 having its lower end closed as shown at 12. The upper end of the bag 11 extends above the upper end of the inner shell and is attached around the periphery of the outer shell as shown at 13. This bag is filled with the grease or other substance 16 to be dispensed.

The open end of the outer shell and hence also the inner bag is closed by a removable cap 14.

The bag 11 is filled with a charge of grease just sufficient to charge a grease gun. To use the cartridge, cap 14 and shell 15 are removed and the open end of the shell 10 is placed or attached on the open end of the grease gun cylinder. The shell 15 is now reversed and pushed into the shell 10 as shown in Fig. 2, pushing the bag and contents down into the shell 10, and forcing the grease into the gun. The gun may now be closed, and the cartridge thrown away.

I make the shell 15, fit within the shell 10 and have its cylindrical walls substantially as long as the shell 10 so that it may be used as a plunger to force out the grease as above described.

The open end of the shell may be fitted with any suitable rim to fit on any particular grease gun, if desired, or to lock upon the open end of the gun if desired. It has more universal adaptability however in the form shown where it simply fits over the gun, or into the flare of the gun, and is held in place during the filling operation.

I claim:

A cartridge for a grease gun comprising an outer shell of a size and shape to mate with the end of a grease gun, a flexible bag within said shell having an open end attached around the periphery of an end of said shell, both ends of said shell being open, and an inner shell fitting into the other end of said outer shell and around said flexible bag, having one end closed whereby the inner shell may be removed and reversed and used as a ram or plunger to force the contents of said bag into a grease Macomber Apr. 2, 1889 Jones Nov. 4, 1952 

